Specifications

Chapter 8 119
Statistical Analysis of Measurement Results
Performing Statistical Analysis
8. Statistical Analysis on
Measurement Results
Performing Statistical Analysis
To perform statistical analysis and retrieve the results, use the following command:
• :CALC:EXAM:GET? on page 225
NOTE Once you have started capturing the data for statistical analysis, changing the number of
data segments to be captured per measurement cycle (for example, through switching
between single-point measurement and list measurement) can generate an error. Even if no
error occurs, changing the number of data segments during data capture would produce
incorrect results.
Do not change the number of data segments captured per measurement cycle once you
have started capturing the data for statistical analysis. If you have inadvertently changed
the number of data segments, re-capture the data (by issuing the :CALC:EXAM:STAR
command again) and then issue the command shown above.
The command shown above returns the statistics based on the measurement results at the
measurement point(s) specified for each specific measurement item. The statistics include
the following 10 items:
• Statistics on the measurement data set from successful measurements (i.e.,
measurements that were detected as neither showing an overload nor exceeding the R
dc
limit range). These include the following:
1. Average
2. Standard deviation s
3. 3´s/average
4. Minimum value
5. Maximum value
• Count data that include the following:
6. Number of successful measurements (number of samples used for statistical
analysis)
7. Number of measurements that were detected to exceed the R
dc
limit range
8. Number of measurements that were detected to show an overload
9. Number of measurements that were detected as either exceeding the R
dc
limit range
or showing an overload or both.
10. Total number of measurements
You can perform statistical analysis only on those measurement items that are currently
displayed on screen with their underlying measurement data stored in memory. These
items can include the following:
• Measurement parameter 1
• Measurement parameter 2
• Measurement parameter 3
• Measurement parameter 4
• Monitored value of the test signal current level
• Monitored value of the test signal voltage level
• Result of R
dc
measurement